In his work Marek focuses on photographing the landscape, historic architecture and protected plants from the area of south-eastern Poland, with particular emphasis on little known and difficult to explore places. These among others include vast loess gorges, expansive forest complexes and everything wild that is hidden on the territories between Roztocze Region and Bieszczady Mountains.

He has repeatedly published his photographs in books, magazines, calendars and multimedia publications in Poland and also abroad (Brazil, Canada, France, Germany, Great Britain, Italy, Japan, Mexico, Sweden, United States).